Description of digital images by region-based contour trees

In analyzing the morphological information of objects in images, isosurfaces play important and application-independent roles. For continuous scalar field, Contour Trees have been used as a tool to select and visualize isosurfaces. However, the tree structure of contour trees is based on the critical points which does not exist in digital images. In this paper, we propose a tree structure of isosurfaces in digital images named Region-based Contour Tree. The proposed method describes a finite number of isosurfaces in digital images completely, without redundancy.